Fading Lots of LEDs Seperatley

Archiver

Hi Guys

Any suggestions on addressing 64 LEDs and setting them all at
different Light Levels to each other under software control?

Has anybody any info in Cross fading of LEDs also?

Cheers for any Help

Chris (UK)

Archiver

There are a lot of people who use the PAK-V for controlling lots of
stage lights and doing things like cross fading. Of course, you'd need 8
of them, so it might be a little much...

On the other hand, to handle 64 outputs you are going to have to do
something external. Even the BS2P/40 will only handle 32 I/O.

Al Williams
AWC
* Floating point A/D
http://www.al-williams.com/awce/pak9.htm



>

---

Original Message

---

> From: christopher_hill2001 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nvD_OBvmzymR231DZBrY9Ca39lEIU4TSXUfRj7xBXKPp_LCCjoDCqrTFchI34GEPoQedXTQGHrrv4APx8ytC]Christopher_Hill@M...[/url
> Sent: Thursday, May 02, 2002 6:39 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Fading Lots of LEDs Seperatley
>
>
> Hi Guys
>
> Any suggestions on addressing 64 LEDs and setting them all at
> different Light Levels to each other under software control?
>
> Has anybody any info in Cross fading of LEDs also?
>
> Cheers for any Help
>
> Chris (UK)
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>

Archiver

You could try using a bunch of 8255's. They are 3 8-bit latched parrall
ports, and only take a 8 bit data in and two addres pins. Combined with a
address decoder, you can probery hook up 96+ Led's

---

Original Message

---

From: "Al Williams" <alw@a...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, May 02, 2002 6:55 AM
Subject: RE: [noparse][[/noparse]basicstamps] Fading Lots of LEDs Seperatley


> There are a lot of people who use the PAK-V for controlling lots of
> stage lights and doing things like cross fading. Of course, you'd need 8
> of them, so it might be a little much...
>
> On the other hand, to handle 64 outputs you are going to have to do
> something external. Even the BS2P/40 will only handle 32 I/O.
>
> Al Williams
> AWC
> * Floating point A/D
> http://www.al-williams.com/awce/pak9.htm
>
>
>
> >

---

Original Message

---

> > From: christopher_hill2001 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=x-ggcoEQpB2U3gZfwK_nt8tyB0fN60d-5BC82XVJH0MZZK7pURMOg2ewGKbL7uR2yxRvuAHyUXri9z0bI7jc3AEi]Christopher_Hill@M...[/url
> > Sent: Thursday, May 02, 2002 6:39 AM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Fading Lots of LEDs Seperatley
> >
> >
> > Hi Guys
> >
> > Any suggestions on addressing 64 LEDs and setting them all at
> > different Light Levels to each other under software control?
> >
> > Has anybody any info in Cross fading of LEDs also?
> >
> > Cheers for any Help
> >
> > Chris (UK)
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
> > Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

Archiver

Take a look at the Toshibia TB62713N Chip, Serial Data in with Constant current
control. We use a DAC for the brightness levels.

--
Gerald Chustz
Design Engineer
ProSport Displays Inc.

Archiver

To do that with 32 leds I used a pic programmed in assembly and a set of
shift registers. The design could easily be upgraded to 64 leds. I'll
post the sourcecode at:

http://www.walrus.com/~raphael/ee/pwm_628c.src

you could maybe make some sort of routine to read commands into the pic
from your stamp.

i hope this helps in some way!
-raphael abrams